What does the Bible say about showing gratitude to God?

In Mark 14, we see Mary demonstrating her gratitude towards Jesus by anointing Him with expensive ointment. This act of devotion reflects the profound recognition of the grace she has received from Christ, who delivered her from demonic possession. As she poured out the ointment, it created an atmosphere of worship and reverence, illustrating that true gratitude compels us to offer our best to God. Similarly, Christians today are called to recognize God's grace and respond with lives that reflect His glory and kindness.